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  1. import java.util.*;
  2. import java.lang.*;
  3.  
  4. class Main
  5. {
  6.     private static void test (String regex, String replace, int repetitions)
  7.     {
  8.         long startTime = System.currentTimeMillis();
  9.         for (int i = 0; i < repetitions; i++)
  10.         {
  11.             String str = "30-Nov-2012 United Kingdom, 31-Oct-2012 31-Oct-2012 United Arab Emirates, 29-Oct-2012 31-Oct-2012 India, ";
  12.             str.replaceAll(regex, replace);
  13.         }
  14.         long endTime = System.currentTimeMillis();
  15.         System.out.println("Execution time: " + Long.toString(endTime - startTime));
  16.     }
  17.  
  18.     public static void main (String[] args) throws java.lang.Exception
  19.     {
  20.         test("(\\d{4})\\s", "$1@", 10000);
  21.         test("(?<=\\d{4})\\s", "@", 10000);
  22.         test("(\\d{4})\\s", "$1@", 10000);
  23.         test("(?<=\\d{4})\\s", "@", 10000);
  24.         test("(\\d{4})\\s", "$1@", 10000);
  25.         test("(?<=\\d{4})\\s", "@", 10000);
  26.         test("(\\d{4})\\s", "$1@", 10000);
  27.         test("(?<=\\d{4})\\s", "@", 10000);
  28.     }
  29. }
Success #stdin #stdout 1.01s 246080KB
comments (?)
stdin 
Standard input is empty
stdout 
Execution time: 164
Execution time: 140
Execution time: 96
Execution time: 135
Execution time: 95
Execution time: 133
Execution time: 94
Execution time: 130
https://ideone.com/WkHLMN
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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